In this colour-scheme only used black and white colour :

Question

Accepted Answer

The correct option is 2:
The term for a color scheme that exclusively uses black, white, and their mixtures (gray) is **Achromatic**. Derived from the Greek roots 'a-' (meaning 'not' or 'without') and 'chroma' (meaning 'color'), achromatic literally translates to "without color." In formal color theory, black and white are classified as neutral colors because they possess no discernible hue. Therefore, any visual composition that intentionally restricts its palette to only the range between pure black and pure white is defined as an achromatic scheme. This artistic choice strips away the psychological effects of color, compelling the viewer to focus entirely on fundamental elements of design such as contrast, light, shadow, form, and texture within the artwork.

The incorrect option is 1:
**Monochromatic** is an incorrect choice because this scheme involves a single *hue*, or true color, and all its variations. Monochromatic, meaning "one color" ('mono-' meaning 'one'), is created by using a base color (like blue, red, or green) and adjusting its lightness or darkness. This is achieved by adding white (to create tints) or adding black (to create shades). While black and white are utilized to modify the base color, the scheme's defining feature is the presence of a core, single hue, which is explicitly absent in a black and white only palette.

The incorrect option is 3:
**Polychromatic** is incorrect as it is the exact opposite of an achromatic scheme. The prefix 'poly-' means 'many,' so a polychromatic scheme is one that utilizes three or more distinct and different hues (colors) from the color wheel. This approach prioritizes a rich variety and complexity of colors. In contrast to the simplicity and focus on value found in a black and white scheme, a polychromatic work uses color to achieve vibrancy, diversity, and visual excitement.

The incorrect option is 4:
**Primary** is incorrect because this term describes a specific category of foundational colors, not a color scheme limited to black and white. The primary colors are the elementary hues (traditionally Red, Yellow, and Blue in subtractive/pigment models) from which all other colors are theoretically mixed. A primary color scheme focuses on the use of these bold hues. Since the question asks for a scheme that *only* uses black and white, the concept of elemental color mixing is not applicable here.